新增Android平台的getInstallReferrer()方法以获取安装来源信息

Description

Added

that returns the install referrer attribution when your android app gets installed (com.android.vending.INSTALL_REFERRER). You can use https://play.google.com/store/apps/details?id=com.myapp&referrer=

Compatibility

| OS | Implemented |
| ------- | :---------: |
| iOS | ❌ |
| Android | ✅ |
| Windows | ❌ |

Checklist

• [X] I have tested this on a device/simulator for each compatible OS


• [X] I added the documentation in
  

  1

  README.md

  .



• [ ] I mentionned this change in
  

  1	CHANGELOG.md

  .

该提问来源于开源项目：react-native-device-info/react-native-device-info